[Samba] Accsse Deny

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Hello people, I'm newcomer these list and I hope someone can help me.

I have an linux machine ( CentOS 5.4 ) that stops the
ntlm authentication. I'm using that machie integrated with Windows
Active Directory ( Win 2008 R2 )

when I run the command ntlm_auth --username myuser  show me follow output

Substituting charset 'UTF-8' for LOCALE
password:
lang_tdb_init: /usr/lib/samba/en_US.UTF-8.msg: No such file or directory
NT_STATUS_ACCESS_DENIED: Access denied (0xc0000022)

Why it's returning Access Denied for me ? I thing the issue is about
unicode as well as it's show on output. but where can I change that ?

I'm able to load users with wbinfo -u or getent passwd

follow my smb.conf

[global]

   workgroup = MYDOMAIN_GROUP
   realm = DOMAIN
   security = ads
   template shell = /bin/bash
   winbind offline logon = false
   winbind cache time = 300
   winbind enum users = yes
   winbind enum groups = yes
   winbind use default domain = yes
   winbind offline logon = false
   winbind separator = /

        netbios name = MYMACHINE
        winbind uid = 10000-20000
        winbind gid = 10000-20000
        wins server = IP of the my Domain controler
        load printers = no
        printcap name = /etc/printcap
        log file = /var/log/samba/%U.%m.log
        debug level = 10
        max log size = 1000
        encrypt passwords = yes
        local master = no
        domain master = false
        dns proxy = no
        preferred master = no
        socket options = TCP_NODELAY SO_RCVBUF=8192 SO_SNDBUF=8192

any tip is welcome.

thanks